Oven lighting system



Aug. 23, 1955 P. l. HOLLMAN OVEN LIGHTING SYSTEM 5 Sheets-Sheet l Filed June 17 1946 ,L umu au? Alllll QWQ QR INVENTOR @muy l /maw ATT Y '5 5 Sheets-SMMl 2 Filed June 17, 1946 NOE INVENTOR y@ Q M BYMMMM ATTY'S Aug. 23, 1955 P. l. HOLLMAN OVEN LIGHTING SYSTEM Filed June 1'7, 1946 mvENToR 6511;@ l www BYWMMM ATTY'S Aug. 23, 1955 P. l. HOLLMAN 2,715,940

OVEN LIGHTING SYSTEM Filed June 17, 1946 5 Sheets-Sheet 4 ATTYS W Wm n. a WM N 5.2% mhh .N

Aug. 23, 1955 P. 1. HOLLMAN OVEN LIGHTING SYSTEM 5 Sheets-Sheet 5 Filed June 17. 1946 INVENTOR United States Patent ti ice 2,715,940 Patented Aug. 23, 1955 ovnN LIGHTING SYSTEM Peter I. Hollman, Rockford, Ill., assignor to Geo. D. Roper Corporation, Rockford, Ill., a corporation of Illinois Application June 17, 1946, Serial No. 677,137 36 Claims. (Cl. 158-131) This invention relates generally to gas lighting devices and particularly to the automatic lighting of gas burning kitchen stoves or ranges.

A problem heretofore unsolved satisfactorily is presented in the lighting of the oven burner of the so-called table top kitchen stove where the oven burner is located at a substantial distance below the top cooking burners.

In the early constructions of table top stoves, the oven burner was lighted by hand, with a match or int resulting in dangerous puiiing or even a serious explosion if the gas was turned on before the match was lighted. Other disadvantages are attendant with this type of lighting in that the housewife or other operator must stoop down to an awkward position to reach the burner within the oven.

In later constructions this objectionable hand lighting has been eliminated by providing a second constantly burning pilot light in the oven, in addition to the one that is provided at the top of the stove for lighting the cooking burners. The oven burner is lighted simply by turning the temperature control knob, in the same manner as the cooking burners are lighted. While in some respects this construction does operate satisfactorily, it is objectionable from the standpoint of the extra cost required to supply this second pilot light with gas.

In still later constructions, a semi-automatic oven lighting system has been devised employing an intermittently lighted sub-burner or oven pilot burner which is lighted by ashback through a ashtube extending to the con stantly burning cooking pilot burner when the oven temperature control knob is turned. inasmuch as a certain time interval is required before the flashback tube can be filled with a ashable gas-air mixture to light the sub-burner, and, for safety, the gas must not be allowed to issue from the main burner ports until the sub-burner is lighted, the operation proceeds in two phases. The housewife first turns the control knob a small amount to a point where it encounters slight resistance to turning. At this position she pauses for a few seconds while the subburner is being lighted. Then, second, when she hears the ash in the ashtube, or after she waits a length of time which by experience she has found suicient to light the sub-burner, she turns the knob further to the desired temperature setting thereby admitting gas to the main burner which is lighted from the sub-burner. While this construction also operates satisfactorily in many respects and eliminates the need for a costly constantly burning second pilot burner, it would be preferable that it be fully automatic so the housewife could light the oven simply by turning the control knob, in a single operation, to the temperature desired, instead of remembering each time to pause in the intermediate position long enough for the sub-burner to be lighted.

In a more recent construction disclosed in my copending application Serial No. 642,941, tiled January 23, 1946, the lighting operation is completely automatic in that the housewife simply turns the oven control knob to the desired temperature setting in one continuous, easy sweep. This construction employs no costly second constantly burning pilot in the oven andusesno outside energy such as electricity, the housewife needs no special training or experience to operate it, and it is absolutely safe and dependable. It represented an improvement over the system described in the preceding paragraph in that it employed a timing mechanism to automatically open the sub-burner and main burner valves in proper timing sequence to, rst, light the sub-burner and, second, light the main burner, the timing mechanism being set into operation by simply turning the oven control knob to a desired temperature setting.

In an automatic lighting system of this type in which the oven pilot flame heats a thermocouple to energize an electromagnet which, in turn, holds a safety valve open, residual baking heat in the oven will prevent the thermocouple from cooling rapidly Vand it may -be as long as 30 seconds after the oven is turned off before the thermocouple will cool suffciently to cause the safety valve to close. If, during this interval of 30 seconds or so, the housewife turns the control knob to relight the oven a temporary hazardous condition would exist in that unlighted gas could pour into the oven through the open safety valve before it could be automatically relighted. My above-mentioned copending application eliminates Vthis hazardous condition in one way by providing an electrical switch operated by the control knob for momentarily opening the thermocouple circuit each time the oven .is turned off or on, thereby allowing the safety valve to be closed even before the thermocouple has cooled.

In certain respects, my present invention may be considered an improvement over my above-mentioned copending application in that I eliminate switching means for momentarily breaking the thermocouple circuit between oven lightings but instead provide an additional auxiliary valve which connects the oven pilot burner directly to the main supply manifold and feeds a secondary stream of gas into the oven pilot burner to maintain a re-igniting iiame at the pilot burner at all times that the safety valve is in an open position. One advantage resulting from this construction is quick relighting in those cases where the thermocouple is still hot from a previous baking period` Another object of the present invention lies in the provision of an entirely automatic oven lighting system in which means in addition to the usual oven pilot burner is provided to maintain a tiny bead of ame in lighting proximity with the oven burner as long as the oven safety valve is open following extinguishing of the oven burner and oven pilot burner in the normal way by turning the control knob to the oif position.

Another object is the provision in an automatic 'oven lighting system of an oven pilot burner having, in effect, a double flame, a long ilame that is normally extinguished when supply of gas to the oven burner is shut off and which is operative to heat the thermocouple to hold the safety valve open, and a small bead flame persists, out of heat Contact with the thermocouple, after the oven burner and long flame are extinguished, the small bead ame being extinguished only after the thermocouple has cooled suticiently to allow the safety valve to close; with this construction the tiny bead ame will be operative to re-light any gas issuing from the main burner during the time following the baking period 'that the safety valve is held open by residual heat in the thermocouple period.

Other objects and advantages will be apparent to those skilled in the art as the invention becomes better understood by reference to the following description when considered in connection with the accompanying drawings, in which- Figure l is a schematic View in perspective vof an safety Vvalve unit employed in the embodiment shown in Figure l, showing the parts in their normal positions before starting the lighting operation; Y

Fig. 3 is a partial outside top view of Fig. 2 taken in the direction of the arrows 3 3;

Fig. 4 is aY partial sectional view of Fig. 2 taken along the une 4 4,

Fig. 5 is a sectional View of Fig. 3 taken along the line 5-'5;

Fig'. 6 is a view similar to Fig. 2 showing the'parts as they will be positioned immediately after the control knob has been rotated to initiate the oven lighting operation;

Figs. 7 'and 8 are views similar to Fig. 6 showing later stages of the lighting operation;

Fig. 7a is a-diagrammatic view similar to Fig. 1a showing ow of gas through the safety valve when the parts are in the Fig. 7 position;

Fig. 9 is an enlarged view of a portion of Figure 1 showing the control knob and temperature regulator,

and with the cover plate for the safety valve operating linkage mechanism removed;

Fig. 10 is a top view partially in section of the control knob, and y Fig. l1 is a `partially cut-jaway front end View of the control knob shown in Fig. 10.

The complete assembly shown in Figure l will be rst'briey described to provide a general background for a subsequent detailed description of the component parts ofy the system. Raw gas is supplied from a manifold 21 to a combined temperature regulator and main shut-off valve generally designated 22, which has a capillary tube l23 terminating in a bulb'24 which lwill be located in the oven and which is responsive to the `temperature to be controlled. The unit 22 delivers gas through a pipe 26 toa timer-controlled safety valve unit 27 from which gas is supplied through a main lineV 28 toa mixing box 29, a mixing tube 31, and a main burner 32. Gas is also supplied from'the safety valve unit 27 through an auxiliary gas line 33 to a mixing tube 34 which delivers an air-gas mixture to a sub-burner generally designated 36, vand havingaplurality of jets 37 for burning a number of individual llames. Opera- Vtion of the safety valve portion of the unit 27 is c0- ordinated with the other parts by a timer portion 35 acting through a linkage contained in a cover plate 1. The sub-burner is preferably located outside the oven or in close proximity to the oven and has a lateral burner arm 38 extending into the oven, or into a compartment within the general'boundary of the oven, and a pilot light or burner 39 located in close proximity to the main oven burner.32. 1 This oven pilot burner 39 is adapted to be lighted by flash-back through the passage 48 from the flames of the sub-burner jets 37, as will be presently -described. Heat from; the pilot burner 39 acts against the thermocouple 41 which isV connected by a two wire iii couple lead 42 which connects with the safety cut-out valve unit 27 which functions to supply gas through the gas line 2 8 to the oven burner 32; that is, the supply of gas to the oven burner will be kept shut olf by the safety valve when the thermocouple y41 is cold.

The usual constantly burning pilot burner 43 located at the top of the stove servesto light any one of the top or cooking burners 44 in the conventional manner Y through its ashtube 46. This pilot burner 43 also 22 and the control knob 49 may be of any suitable or preferred construction, forexample, of the type of that Y disclosed in Patent 2,303,011, granted November 24, 1942, to which reference may be had forV a more detailed description. Briefly, the operation is such that the housewife rotates the control knob toselect the proper temperature setting, causing the unit to admit gas simultaneously to the safety valve inlet line 26 and theoven pilot burner inlet line 51. Where it is desired to prevent the controlknob from beingY operatedby casual orv accidental movement, as, for example, where very small children have access to the stove, the control knob constructionVV may readily take a form in which the turning of the knob must first be preceded by depressing it in the'order of 1A; of an inch or so, as is also described inthe abovementioned Patent 2,303,011. Y

Referring now to Figs. 2 5, inclusive, the timer controlled safety valve unit 27 comprises a body or casing 52 which in one integral structure may contain both the timer 35 and the safety valve assembly 30, the one end of which the linkage mechanism 126 is k'mounted within the cover casing 1. The safety valve portion of the unit 27 has fitted at one end a closure 53V and at the other end a cup-shaped cover 54, both members 53and 54 being threadedly engaged vwith the end of the casing 52. It'has the inlet port 56 connected to the temperature controller 22, the main outlet .port 57 leading to the main oven burner 32, the auxiliary outlet port 5S leading to the sub-burner 36, an auxiliary inlet port 2a leading from the line 2 which is connected directly to the manifold .21, and an auxiliary outlet port 58a leading to the oven pilot burner supply line S1. Flow of gas to the oven burner 32 .is startedy and stopped bythe main or safety valve disk 59 which is loaded by the helical spring 61 Yand guided by the reciprocable valve stem 62. Flow of gas to the sub-burner36 is started and stopped by the auxiliary valve 63 which is loaded by the helical spring 64,'vthis auxiliary valve being tippably engagedv with the safety valve disk 59 toA maintain it in an open. position when valve 59 is closed, and vice versa. A secondary flow of gasto the oven pilot burner supply line 51, in addition to the gas supplied through line 3 from the temperature regulator, is started and stopped bythe auxiliary valve 4 whichvis loaded byl the helical spring S, this auxiliary valveA being tippably engaged with the disk or extension 6 mountedupon vthe shaft 7 so that whenthe main valve 59 is closed the auxiliary valve 4 will likewise be closed, and when valve 59 is open valve 4 will be Y tipped openfby engagement with the extension 6.v The annular angeor shoulder 162 which is received in a tubular end 163 of the shaft 7 and is secured therein by a key spring 164 interfitting in transaxial slots'165 formed on Athe tubular end portion `163 of the shaft '7. As shown a compression spring 8 is disposed between a disc 166 abutting the shoulder 162 of the valve stem 62 and the bottom of the tubular end portion 163 to urge the annular shoulder into engagement with the key spring 164v and to insure that the shaft 7 and stem 62 are in extreme axial positions relative to each other.. This spring Ypermits limited lost motion between the's'tem 62 and the shaft 7 which is utilized primarilylas atake-up mechanism in the assembly `due to variations in the length ,of the stem 62r andythe shaft 7, respectively, andV associated parts. Thus, when ,the shaft '7 is moved axially by the pin 136 the shaftV 7 'and stem 62`-are normally moved axially bodily in unison. Should the valve element 59 supported onthe valve stem 62 in its movement. tothe left as shown in Fig. 2, for any reason, such asinsuflcient tolerances in the manufacturing of the respective parts, engage the wall 12in the housing 54 before the toggle mechanism 126 passes through its center position as shown in Fig. 7, it is to be understood that the shaft 7 moves relative to the stem 62 through the lost motion connection to permit the mechanism to go through its center position. v

At the opposite end of the safety valve portion, within the cup-shaped cover or bell housing 54, is a U-shaped electromagnet 68 having coils 69 which are energized by the current from the thermocouple 41 when a tlame from the oven pilot burner 39 impinges upon it, this current being connected through the bell housing by means of the thermocouple cable 42 which is suitably insulated from the housing 52. The armature 73 is mounted upon the end of shaft 9, which carries the safety valve disk 59 and which is guided within the packing member 10 which is maintained between the formed sheet metal walls 11 and 12. The armature 73, when placed into contact with the electromagnet 68 by an outside force applied to the end of the shaft 7, against the thrust of the spring 61, is adapted to be held in the position shown in Fig. 8 when the electromagnet is energized by thermocouple current. The armature stem 9 is limitedly reciprocable with respect to the shaft 7 so that the armature may be held against the electromagnet and at the same time allow the shaft 7 to be moved independently for reasons which will be considered in greater detail below. A pair of thin flexible diaphragms 13 and 14 held in place by retaining n'ng 13a and the screwed-in cap 53 serve to prevent the escape of gas from the auxiliary valve chamber 15.

The timing mechanism, generally designated 35, is substantially the same as that disclosed and claimed in my copending application, Serial No. 642,941, to which reference may be had for a detailed description of its construction and operation. Briey, it comprises a cylindrical housing portion 82 in which is positioned a first bellows 86 and a second bellows 87. The bellows 87 is mounted at one end upon an apertured plate S8 which is attached to the bellows shaft 89 and also to the spacer tube 90. The spacer tube is connected to one end of the bellows 86 by means of a plate 91 carrying a large check valve 92 mounted thereon and maintained in a normally closed position by means of the spring 93. When the shaft 89 is depressed the bellows 86 will be reduced in volume and fluid contained therein will flow into the chamber 94 outside of bellows 87, passing through the check valve 92. The bellows members will preferably be made of metallic material capable of storing up a certain amount of energy when compressed in this manner and when the force on the end of the shaft 89 is released the stored up energy in the bellows will tend to be released and cause back ow of fluid from chamber 94 to the interior of bellows 86, this back flow passing through the return passage 95 where its return will be determined by the size of the orifice 96.

The operating linkage or cycle mechanism previously referred to generally as 126 is substantially the same as that previously disclosed and claimed in the above-mentioned copending application Serial No. 642,941. This mechanism includes the double-ended lever 116 which is mounted upon the shaft 127 which is rotatable by the manually operated control knob 49. It includes also the toggle 128 having toggle bars 129 and 130, and the detent link 111. The linkage is mounted on a bracket 135 having spaced upper portions 131 and spaced lower portions 132. The bracket 135 is mounted upon the plate 100 by means of screws 101 and the plate 100 is in turn mounted upon the casing 52, as by means of bolts 102. The shaft 127 which carries the lever 116 is pivotally mounted within openings formed in the lower bracket portion 132. The toggle 128 has an end pivot pin 134 fixed in the upper portion 131 and a movable end pivot pin 136 reciprocably mounted within slots 103 against the action of the spring 139.

formed in the bracket in axial alignment with the shaft 7; in addition, its knee pivot pin 138 is engaged with the end of the detent link 111. A formed wire spring 139 engages the detent link and the toggle bar 130 in such a manner as to urge the detent link in a clockwise direction around the knee pin 138 and to urge the parts upwardly. A hook 141 is attached to the toggle bar 129 in such a manner as to engage one end portion of the lever 116. The detent link 111 is formed with a longitudinally extending slot 104 having a lower end portion or shoulder 105 which engages the axial extension 106 of: the adjusting shaft 107 when the parts are in the operative position shown in Fig. 6. The link 111 is also provided with an upwardly facing shoulder 108 which likewise engages the extension 106 in the operative position shown in Fig. 7, at which position the toggle pivot pins 134, 136 and 138 are axially aligned to move the armature 73 into contact with the electromagnet 68.

Thus, in operation when the actuating shaft 127 is rotated clockwise as viewed in Fig. 2 by engagement of the control knob extension 109 (Fig, l0) with the spring 110 (Fig. ll) when initially moving the control knob to select a temperature setting, the bellows shaft 89 will be moved to the inward limit of its travel to displace the maximum amount of fluid through the check valve 92 engages the link 111 on opposite sides of the slot 104 and moves the link 111 counterclockwise about the pin 138 When the shaft 89 has moved a predetermined distance, the link 111 is moved to a position wherein the shoulder 105 is moved out of engagement with the detent 106. At this instance the toggle mechanism being biased by the spring 139 operates to move the link 111 bodily in an upward direction to an intermediate position as shown in Fig. 7. This bodily movement is arrested however when the shoulder 108 engages the detent 106. At this position of the parts the toggle pivots are in alinement and the valve elements g 4 and 59 are open and the valve element 63 is closed.

The respective parts maintain this position until movement of the shaft 89 and the abutment 160 causes the link 111 to be moved still further in a counterclockwise direction against the acon of the spring 139 so that the shoulder 108 clears the detent 106. As soon as this occurs the toggle mechanism again acts to move the link 111 bodily upwardly to assume the position shown in Fig. 8.

Referring more specically to the sub-burner unit generally designated 36, it comprises a formed metallic housing which may be made of cast iron or the like and will normally be positioned between the stove walls (not shown). Extending laterally from the sub-burner is the pilot burner arm 38 which terminates at a position where the oven pilot burner 39 is in lighting proximity with the main oven burner 32. The arm 38 is formed with the passageway 148 furnishing communication between the oven pilot burner supply tube 51 and the oven pilot burner 39. A mixing tube 149 is interposed between the supply -tube 51 and the arm 38 for the admission of primary air. A flashback passage 48 is formed in the arm 38 and is aligned with the aperture 152 formed in the side of the sub-burner so that when gas is supplied to the sub-burner, and the jets 37 are lighted, a portion of the gas will issue from the aperture 152 and burn. The oven pilot burner 39 has a jet (not shown) pointed into the passage 48 so that when gas is supplied to it through the passageway 148, a portion of this gas will ll passage 48 and ash back to light the pilot burner 39 from the sub-burner.

Vposition under the urgence of spring 93.

yinto the flash Vtube generally designated 47 which communicates with the upper or constantly burning pilot light 43. The ash tube 47 may be formed in any suitable manner. In the present instance, it comprises an upper imperforate horizontal portion 157 and a lower perforate vertical portion 158 the exact constmctionand operation of which is described in my copending application Serial Y No. 642,941, to which reference may be had for a detailed description. A v f Y Operation In considering the'operation of the present invention,

i assume, for example, that the oven is cold and the housewife desires to light the oven. All that is necessary for her to do is to turn the control knob 49=to the desired temperature setting. The lighting operation itself will be carried on from there automatically by the abovedescribed apparatus without further thought or action by Y mounted on the shaft 127V as by means of the screw 201.` The leaf spring 110 will bemounted in such a manner that when the control knob 49 is` rotated clockwise, as seenin Fig..l1, the movement of the extension 109 will be transmitted directly to the lever 200 but when the control knob 49'is rotated counterclockwise, as seen in Fig. 11, the spring 110 will simply flex to the right and allow the extension 109 to be moved past the lever 200. Fig. 2 is a back view of the safety valve unit 27 and hence in this gure rotation of the shaft 127 (which is counterclockwise in Fig. l1) will be clockwise, that is, the initial temperature setting movement of the control knob will cause the double-headed lever 116, asV shown in Fig. 2, to be moved clockwise to the position shown in Fig. 6. This will move the detent link'111 to its lowermost lirnitrwhere it will be held by engagement ofthe shoulder 105 upon the detent extension 106. Concurrently with this, the bellows shaft 89 and spacer tube 90 will be moved to assume inward positions compressing the bellows members and displacing uid through the check valve 92 into the chamber 94. At the end of this inward movement the check valve will resume its seating As will'be seen by reference to Figs. 2 and' 6 the positions ofthe valving will be the same before and after this initial setting movement of the lever 116.

By compressing the bellows, a certain amount of energy will be stored up in them rto urge them back to their original Vpositions and the displaced fluid will be slowly moved back through the return tube 95,' the rate of return ow being determined by the size of the orice 96. As the uid so returns, the bellows shaft 89 will be moved slowly outwardly to actuate the cycling linkage.

During this rst step in the operation, when the end 105 of the .detentslot 104 in link 111 is engaged bythe detent extension 106, as shown inrFig. 6, gas will flow from the regulator 22, through line 26, the inlet port 56 of the safety valve unit 27, sub-burner auxiliary valve 63, and sub-burner supply line 33 to the sub-burner where it will issue from ports 37 'into theashtube 47. 'Simultaneously gas is Ysupplied to the pilot burner 39'from the line 3, one end of which is connected to the line 51, the

Vother end of which is connected to the main shut-off valve 22.` VPilot burner 39 has Va transverse jet opening (not shown) which directs a supply of gas into flash passageway 48.- The gas rising in ash tube 47 will be 8l Y mixed with Vair drawn in throu'ghrthkefmixing tube 34 as well as-through openingsfin the mixing tube 153 and the ash tube itself. Asv soon as'this gas-air mixture emerges from the top of the tube 47 into proximity with the ame of the upper pilot burner 43, it will ignite the sub-burner byY hash back through the tube 47.y Then by flash back through the passage 48 the pilot burner 39 will be ignited, being supplied by gas from line` 3 and line 51 as aforesaid. l Y v The ame from the oven pilot burner 39 Vwill heat the thermocouple 41, causing it to energize the electromagnet. The rate of outwardmovement of the bellows shaft 89 and the abutment 160 and the position of the adjusting screw V107 will be such that at this time the detent link shoulder 105 will be released from the detent extension 106. Simultaneously the link111 will be snapped upwardly by the. spring 139 to the temporary or intermediate position shown in Fig. 7 where the shoulder 108 on the link engages the extension 106. In this position, the

toggle pivots are aligned to press-the valve stern 9 to the inward limit of its travel with the armature 73 pressed upon the eleetromagnet. Y Y' Y During this second orintermediate step in the operation, as shown in Fig. 7, the auxiliary valve 63 will be closed to shutV olf 'the supply `of gas to the sub-burner; and the auxiliary valve 4 willfbe opened to supply gas directly from the manifold .21 to the oven pilot burner 39 through line 2, the auxiliary valve 4 and the line 51. This `is in addition to the gas supplied through line 3. The safety valve 59 is also opened Vto permit the ow of gas to the main oven burner 32.

Gas issuing from the main oven l,burner 32 will then be ignited by the oven pilot burnerv 39. l

As soon as the thermocouple 41 is heated suficiently byv the pilot flame to enable the electromagnet to hold the armature by itself, the further outward movement of the bellows shaft 89 and the abutment 160 effects release of the detentlink 111 from the detent 160 so that the link/111.will be snapped upwardly to the normal position shown in Fig. 8, by the spring 139. The position of the valves will be unchanged from the-Fig. 7 position, however, as the valve stem vwill now beheld in the extreme inward position by the electromagnet 68, instead of by'V the toggle 128. In this, the normal baking position, the

oven will be supplied with gas through the open safety line 2 which is regulated by the pilot burner auxiliary valve 4. Y Y v If at any time during the bakingperiod the main oven burner 32 is extinguished, the hazardof unburned gas filling the kitchen is eliminated by the pilot burner 39 which is normally burning during the'baking period..

f If, for any reason, the oven pilot burner 39 is also extinguished the thermocouple 41' will begin cooling immediately to cause the electromagnet to release the armature 73 andV permit the spring 61 to close the safety valve 59. This shuts off the main liow of gas to the oven burner 32, and since valve 63 and valve 4 are actuated in unison with the safety valve 59, thevalve 63.is movedV to an open position and the valve 4 is moved to a closedV To shut olf the oven at the end of the baking period, Y

the housewife will turn the control knob 49 back tor-the zero or off position. This will cause the control knob extension k109 to snap past the leafspring110 to -the posi- 5 tion shown in Fig. 11. This will also extinguish the main oven burner by shutting off the ow of gas to it within the controller 22. Due to the residual baking heat in the oven the thermocouple will not immediately cool to the point where the armature 73 will be released by the electromagnet and it may be as long as 30 seconds in some cases before it will cool sufficiently to allow the safety valve to be closed, If, during this interval of 30 seconds or so, the housewife decides to re-light the oven and turns the control knob to do so, it is desirable that there be means to re-light this gas to eliminate the hazard of a large volume of unburned gas being discharged into the oven. ln this instance, such means, constituting an important part of the present invention, resides in the pilot burner auxiliary valve 4 which is connected directly to the manifold and supplies the oven pilot burner 39 with a small quantity of gas from line 2 through the line 51 sucient to maintain a bead of ame at the pilot burner even after the main pilot burner stream in line 3 is shut off within the temperature regulator 22. The amount of gas passing through line 2 is regulated by the throttling valve 202 to render the bead flame small enough that it will not impinge directly upon the thermocouple and, therefore, will not interfere substantially with the cooling of the thermocouple; yet is suiiiciently large that it will light the main burner in the event gas should issue from the ports thereon. Thus, in effect, the pilot burner 39 becomes a stand-by pilot burner during this phase of the operation of the oven lighting system. When the thermocouple does cool to the point where the armature is released by the electromagnet the safety valve 59 will be moved to the Fig. 2 position to close o the pilot burner auxiliary valve 4 and extinguish the pilot bead ame.

While a particular form of the present invention has been shown it will be apparent that minor changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope of the invention. Having thus described the invention, what is claimed as new is:

l. ln an oven lighting system, the combination of an oven burner arranged to be connected to a gas supply, a safety valve for controlling the flow of gas to said oven burner and having an open and a normally closed position, ignition means for said oven burner, a stand-by pilot burner for lighting said oven burner, a thermocouple out of heat transmission relation with said stand-by pilot burner and responsive to the heat of said ignition means, said safety valve having an electromagnet connected to be energized by the thermocouple current to hold said safety valve open when said thermocouple is heated to a predetermined temperature by said ignition means, and auxiliary valve means for controlling the ow of gas to said stand-by pilot burner and controlled by said safety valve for maintaining a ow of gas to said stand-by pilot burner as long as gas is supplied to said oven burner through said safety valve.

2. In an oven lighting system, the combination of an oven burner connected to a source of fuel, a pilot burner for said oven burner, a thermocouple positioned adjacent said pilot burner, a safety valve controlling the starting and stopping of the ow of fuel to said oven burner, electromagnetic means operatively associated with said safety Valve and said thermocouple for maintaining said safety valve in a flow-permitting position when said thermocouple is heated to a preselected temperature, means for maintaining a flame on said pilot burner in lighting proximity with said oven burner and in heat transmitting relation with said thermocouple while the oven burner is ignited, and means for maintaining a llame on said pilot burner in lighting proximity with said oven burner and in substantially reduced heat transmitting relation with said thermocouple for a limited time after extinguishment of said oven burner.

3. In an oven lighting system, the combination of an oven burner connected to a source of fuel, a pilot burner in lighting proximity with said oven burner, manually' operable valve means controlling the starting and stopping f fuel to said oven and pilot burners, a thermocouple positioned adjacent said pilot burner, a safety valve controlling the starting and stopping of the flow of fuel to said main burner, electromagnetic means operatively associated with said safety valve and said thermocouple and operative to maintain said safety valve in an open position when said thermocouple is heated, said pilot burner ame being of such dimension as to irnpinge upon said thermocouple to energize said electromagnetic means to hold said safety valve open when said manually operable valve means is open to supply fuel to said oven and pilot burners, and additional valve means operatively associated with said safety valve to supply said pilot burner with a reduced quantity of fuel between the extinguishment of said main burner by closing said manually operable valve means and the closing of said safety valve in response to the cooling of said thermocouple.

4. An oven lighting system for a gas stove or range having in combination a gas supply manifold, an oven burner, a heat control unit for regulating the ow of gas from the manifold to the oven burner, a constantly burning pilot burner and an oven pilot burner, flash-back means including an intermediate sub-burner for lighting the oven pilot burner from the constantly burning pilot burner, gas lines connecting said heat control unit with said oven burner and said sub-burner, safety valve means operatively associated with said gas lines for alternately directing gas to said sub-burner and said oven burner, temperature responsive means operatively associated with said oven pilot burner and said safety valve means for maintaining the ilow of gas to said oven burner when heated by said oven pilot burner, a conduit for conducting gas from said heat control unit to said oven pilot burner, a by-pass conduit for by-passing an additional amount of gas around said heat control unit directly from said manifold to said oven pilot burner, valve means in said by-pass conduit operable in response to movement of said safety valve means for maintaining a supply of gas to said oven pilot burner at all times that gas is directed to said oven burner by said safety valve means, and a control knob manually operable for regulating the ow of gas from the manifold to the heat control unit and for setting the temperature to be maintained by said unit, and timing means operably engaged with said safety valve means and conditionable for operation by movement of said control knob to control said valves whereby gas initially flows to said oven pilot burner and said sub-burner and after a predetermined period the flow of gas to said oven burner is started and the supply to said oven pilot burner is increased.

5. In an oven lighting system, the combination of an oven burner, a conduit for connecting said burner to a source of fuel, a rst combination pilot burner and supply means in lighting proximity with said oven burner, an electromaguetically controlled safety valve connected in said conduit for controlling the flow of fuel to said oven burner, a thermocouple operatively connected to the electromagnetically controlled valve and positioned in the flame of said first combination pilot burner and supply means to produce a current upon a predetermined temperature to maintain said valve in an open position, second valve means operative to simultaneously control the ow of fuel to said oven burner and said rst combination pilot burner and supply means, a second combination pilot burner and supply means arranged to be connected to a source of fuel and in lighting proximity with said oven burner, and third valve means for controlling the dow of fuel to said second combination pilot burner and supply means and responsive to movement of said safety valve for maintaining the iiow of gas to said second combination pilot burner and supply means to maintain it lighted after said second valve is operated to shut olf the ow of 5 fuel to the oven burner and said first combination pilot burner and supply means and untiltsaid safety valve is closed in response to the cooling of said thermocouple.V

6. In an oven lighting system, the combination of an oven burner, a conduit for connecting said burner to a source of fuel, a rst combination pilot burner and supply means in lighting proximity with said oven burner, an

electromagnetically controlled safety valve connected inl said conduit for controlling the flow of fuel to said oven burner, va thermocouple positioned in the flame of said first combination pilot burnerrand supply means and capable of generating a current at a predetermined temperaturefor energizing said safety valve to maintain the latter in an open position, a manually operable heat control Y unit for simultaneously controlling the flow of fuel to said oven burner and said first combination pilot burner and supply means, a second combination pilot burner and supply means in lighting proximity with said oven burner, andsecond valve means .connecting said second combination vpilot .burner and supply means directly with said source of fuel and operable by said safety valve to maintain the second combination pilot burner and supply means lighted after .the flow of gas-to said oven burner and said rst combination pilot burner and supply means is stopped by said heat control unit and until said safety valve. is closed in responsev to the cooling of said thermocouple to a preselected temperature.

7. In an oven lighting system, the combination of an oven burner connected to a source of fuel, a pilot burner in lighting proximity with said oven burner, a thermocouple positioned adjacent said pilot burner, a safety valve for controlling the flow Vof fuel to said oven burner and having an open and a closed position, means for biasing said valve to its closed position, means for moving said Safety valve to its open position, electromagnetic means operatively associated with said safety valve and said thermocouple for maintaining said safety valve in an open V,position upon a predetermined heating of said thermo-A couple, and means for supplying fuel to said pilot burner to maintain a flame large enough to heat up said thermocouple for producing a current to actuate said electromagnetic means while the safety valve is open and the oven burner is ignited and to maintain a flame small enough for a limited period of time after extinguishment of said oven burner and before the safetyY valve closes which is available for lighting purposes but which produces insuicient heat to effect a cooling of the thermocouple.

8. In an Voven lighting system, the combination of an oven burnerrconnected to a-fuel supply, a safety valve for controlling the ilow of fuel to said oven burner, `manually operable means for controlling the flow offuel from said supply to said safety valve, a pilot burner in-lighting prox-A imity with said oven burner, a thermocouple positionedadjacent said pilot4 burner and capable of generating a predetermined Ycurrent ata preselected temperature, electromagnetic means operatively associated with said safety valve Aand said thermocouple to maintain said safety valve in an open position when said thermocouple produces said current, and means for supplying fuel to said pilot burner from two sources, the flow of fuel from one of said sources being under the control of said manually operable means and the ow of fuel from the other source being under the control of the safety valve, said sources being effective to supply a combined fuel stream to said pilot burner to produce a liame capable of impinging on said thermocouple when-said manually operable means is in'an open position and said safety valve is open whereby the thermocouple energizes said electromagnetic means to maintain said safety valve in the open position and being eective when said safety valve is open and the manually` operable means is in a closed position to supply a reduced fuel stream to said pilot burner to produce a Vpilot llame which is ine'nective in heating said thermocouple while at the same time is of sufficient size to ignite 12vv Y Y having in-combination a gas supply manifold, an oven burner, a heat control unit including a shut-olf valve for regulating the ow of gas from the manifold to the oven bur-nena constantly burning pilot burner, an oven pilot burner, flash-back means including a sub-burner for` lighting the oven pilot burner from the constantly burning pilot burner, irst conduit means for connecting said heat control unit with said oven burner and said sub'- burner, second conduit means for conducting gas from said heat control unit to said` oven pilot burner, thirdV conduit means connected to said second conduit meansV for conducting gas directly fromV said manifold to said oven pilot burner,rvalve means in said rst and third conduitV means for controlling the flow of gas respectively to said oven burner, said sub-burnerY and said oven pilot burner, and timing means operatively associated with said valve means in the irst and third conduit means and actuated by operation of said shut-olf valve for controlling the movement and position of said valve means in the first-and third Vconduits whereby gas initially flows to said oven pilot burner and said sub-burner to effect the lighting ofsaid oven'pilot burner and after a predetermined period the flowrof gas to said sub-burner is stopped-and the flow to said-oven .burner is started and Y the supply to said pilot burner is increased. Y

l0. In an oven burner lighting system, the combination-of an ovenburner arranged to be connected to a rst gas supply, an electromagnetically operated safety valve for controlling the ow of gas to said oven burner and having an open and a closed position, a pilot burnerl mounted in lighting proximity to said oven burner and arranged to be connected to said gas supply, manual valve means for controlling the flow of gas-to said safety valve and to said pilot burner, temperature responsive means mounted adjacent said pilot burner and having-capacity at a predetermined temperature for producing a current capable of energizing, the electromagnetically operated safety valve to maintain-said latter in the open position, second means for supplying gas to said pilot burner independently of said manual means to supplement the supply of gasfrom said first source, second valve means operatively associated with said second supply means andcontrolled by said safety valve forfcontrolling the flow of gas from said second supply lmeans to said pilot burner, said second valve means arranged to start the flow of gas from said second supply means when the safety valve is in the open position and to stop the flow when the safety valve is in the closed position, and timing means actuated by operation of said manual means for controlling theV sequence of operation of said safety valve and said second valve means whereby gas initially flows lto said pilot burner from the rst `supply and after arpredetermined time gas flows to said oven burner from the Y first supply and gas flows to said pilot burner from rst 'supply and the second supply meansf Y ll. In an oven burner lighting system utilizing a firstV pilot burner on the top of Va gas range or stove for flash back ignition purposes, the combination of an oven burner mounted in spaced relation to said first pilot burnerand arrangedv to be connected to a first gas supply, an electromagnetically operated safety valvefor controlling the flow of gas tov said oven burner, a second pilot burner mountedk in lighting proximity` to said oven,

burner and arranged to be connected to a Vgas supply, means for lighting the second pilot burner from the tirst pilot burner, manual'valve means for controlling the.

iiow of gas to said safety valve and to said second pilot burner, second means for supplying gas to said secondV pilot burnerl independentlyv of said Vmanual means 5to supplement the supply of ygas from said first source,sec ond valve means operatively associated withsaid-second supply means andrrcontrolled by said safety valve for controlling the ow of gas from said second supply meansV Ato said second pilot burner, said second valve means arranged to start the ow of Vgas from -said second4 supply means when the safety valve is in an open position and to stop the ow when the safety valve is in a closed position, and means initially actuated by said manual control means for controlling the sequence of movements of said safety valve and said second valve means whereby gas initially flows to said second pilot burner to be ignited by said hash-back means and after a predetermined time gas flows to said oven burner from its supply and gas ows to said second pilot burner from both of its supplies.

12. In an oven lighting system, the combination of an oven burner connected to a source of fuel, a safety valve controlling the flow of gas to said burner, manual control means having an open and a closed position for controlling the flow of gas between said source of fuel and said safety valve7 electromagnetic means operatively associated with said safety valve, a thermocouple operatively connected to said electromagnetic means and responsive at a preselected temperature to produce a current for energizing said electromagnetic means to maintain the safety valve in an open position, means for maintaining an ignition flame in heat transmitting relation with said thermocouple to heat said latter to the preselected temperature while said manual control means is in its open position, and means for maintaining a stand-by ignition flame in lighting proximity with said oven burner and out of heat transmitting relation with said thermocouple after the manual control means is moved to its closed position and before the safety valve closes.

13. In an oven lighting system, the combination of, an oven burner adapted to be connected to a source of fuel, a safety valve controlling the ilow of fuel to said oven burner and having an open and a closed position, said valve being normally biased to a closed position, means for moving said valve to its open position to effect ow of fuel to the oven burner, electromagnetic means operatively associated with said safety valve for holding said valve in the open position, ignition means in lighting proximity to said oven burner for lighting the latter, a thermocouple disposed to be heated by said ignition means and operable upon a predetermined temperature to generate a current for energizing said electromagnetic means, and means for maintaining a stand-by pilot flame in lighting proximity with said oven burner out of heat transmitting relation with said thermocouple as long as said safety valve remains open.

14. In a main burner lighting system, the combination of a main burner arranged to be connected to a gas supply, a constantly burning pilot burner, a safety valve movable between a normally closed position and an open position to control the ow of gas to said main burner, means for biasing said safety valve to said closed position, first pilot burner means adjacent said main burner and arranged to be connected to a gas supply, second pilot burner means adjacent said main burner and arranged to be connected to a gas supply, means for igniting the first pilot burner means from the constantly burning pilot burner, thermal responsive means responsive to the heat of said rst pilot burner means operable to hold said safety valve in its open position when said thermal responsive means is heated to a predetermined temperature by said first pilot burner means and auxiliary valve means connected with said second pilot burner means for controlling the flow of gas thereto and controlled by said thermal responsive means to maintain a ow of gas to said second pilot burner means as long as gas is supplied to said main burner through said safety valve.

15. In a lighting system, the combination of a main burner connected to a source of fuel, first pilot burner means adjacent said main burner, a second pilot burner means adjacent said burner, a constantly burning pilot burner, means for lighting the first pilot burner means from said constantly burning pilot burner, a safety valve movable between an open and a normally closed 'position to control the ow of fuel to said main burner, thermal responsive means responsive to heat of said rst pilot burner means operatively associated with said safety valve for maintaining said safety valve in an open position when said thermal responsive means is heated to a preselected temperature, and means for maintaining a stand-by flame on said second pilot burner means out of heat transmitting relation with said thermal responsive means and in lighting relation with said main burner until said thermal responsive means cools to effect closing of the safety valve.

16. In a burner lighting system, the combination of a main burner connected to a source of fuel, a constantly burning pilot burner, a safety valve controlling the oW of fuel to said main burner having an open and a closed position, means for biasing said valve to its normally closed position, means for opening the safety valve, .thermal responsive means operatively associated with said safety valve for maintaining it in said open position when the thermal responsive means is heated to a preselected temperature, an ignition pilotburner means for producing a flame adjacent said main burner for igniting the same and for heating the thermal responsive means, ash means for lighting the ignition burner means from the constantly burning pilot burner, a stand-by pilot burner means for producing a ame in lighting relation to the main burner and out of heat transmitting relation with the thermal responsive means, and means responsive to said thermal responsive means for supplying gas to said stand-by pilot burner means until said thermal Iesponsive means cools to effect closing of the safety valve.

17. In a burner lighting system, the combination of a main burner arranged to be connected to a fuel supply, a temperature control unit for regulating flow of gas to the main burner including a shut-off valve, a constantly burning pilot burner, a second pilot burner means for lighting the main burner, flash-back means for lighting the second pilot burner means from the constantly burning pilot burner including a sub-burner, first conduit means for connecting said temperature control unit with said main burner and said sub-burner, second conduit means for conducting fuel from said temperature control unit to said second pilot burner means, third conduit means connected to said fuel supply for conducting gas to said second pilot burner means, valve means in said iirst and third conduit means for controlling the ilow of gas to said main burner, said sub-burner and said second pilot burner means, and means for controlling the operation of said valve means in the first and third conduits to initially cause gas to flow first to said second pilot burner means and said sub-burner to effect the lighting of said second pilot burner means and thereafter to stop the flow of gas to said sub-burner and establish the ilow of gas to said main burner and said second pilot burner means.

18. In a main burner lighting system, the combination of a main burner adapted to be connected to a source' of fuel, a safety valve controlling the ow of fuel to said main burner having an open and closed position, means for normally biasing said valve to its closed position, means for moving said valve to its open position, a pilot burner for said main burner, shut-off valve means having an open and a closed position for controlling the flow of gas to said pilot burner and to said safety valve, means responsive to movement of said shut-off valve to its open position for igniting said pilot burner, thermal responsive means adjacent said pilot burner and operative in response to heating thereby to hold said safety valve in its open position, and means for maintaining a stand-by pilot burner flame sufficiently large to light said main burner until said thermal responsive means cools to effect closing of said safety valve and small enough to be insuicient to heat the thermal responsive means for a 15 limtedtperiod of time after extinguishment of said main burner. f

19. In a mainV burner lighting system, the combination of a main burner connected to a source of fuel,`a

Y safety, valve controlling the ow of gas to said main burnerv andhaving an open and a closed position, manual control means for controlling the ow of gas between said source of fuel and said safety valve and having an Yopen and a closed position, thermal responsive means responsive toa preselected temperature for holding said safety valvein an openfposition, means for maintaining a ame in heat transmitting relation With said thermal responsive means to heat said latter to said preselected temperature while said manual control means is in its open position, and means for maintaining a stand-by flame in lighting proximity with said main burner and outfof heat transmitting relation with said thermal responsive means after the'control means is moved to its closed --position and until the safety valve closes.

. 20. In a main burner lighting system, the combination of a main burner adapted to be connected to a source of fuel, a rst combination pilot burner and supply means in lighting proximity with said main burner, a'safety valve controlling the iiow of gas to said main burner and t havingaan open anda closed position, manual control means for simultaneously controlling the ow of fuelV to said safety valve and said ,first combination pilot burner and supply means having an open and a closed position, means responsive to movement of said manual control means to its open position for igniting said rst pilot burner and supply means in lighting proximity withV said main burner, Vand second valve means connecting said second combination pilot burner and supply means directly with a source ofefuel and responsive to said thermal responsive means to maintain the second combination pilot burner and supply means lighted after the iiow ofigas to said main burner and the irst combination pilot burner and supply means is stopped by said manual control .means and until said safety valve .is closed..

21. In a main burner .lighting system, thecombination ofra main burner connected to a gas supply, main shutoff valve meansin the gas supply line to the main burner having anopen position permitting the supply of gas thereto,` normally closed safety valve means in the gas supply line tothe main burner ycontrolling the ow of gasY thereto, Vmeans controlled by the position of said safety valve means for the main burner for maintaining a pilotriamein lighting yproximity to the main burner independently ofthe position of said main shut-ofi valve meansas long Vas said safety valve means is open, ignition means for the main burner, and means responsive to the positioning of said main shut-ofi valve means in said open position thereof to condition said ignition means for igniting the main burner and to open said safety valve means after said conditioning of said ignitionmeans to supply gas to` the main burner.

'22.'In' an oven lighting system for a gas stove, the combination of a main-burner connected to a gas supply, a manually actuated main shut-off valve in the gas supply line to'the main burner movable to openiposition to permit theV supply of gas to the main burner, a safety valve in the gas supply line to the main burner having an open position permitting the supply of gas to the main burner, ignition means for the main burner, means responsive to the movement of lsaid mainrshut-off valve to open position to condition said ignition means for igniting the mainburner, means responsive to said movement of said main shut-off valve ;to said open position to open said safety valve to supply gas to the main burner for ignition by said ignitionmeans, and meansy controlled in response to the position of said safety valve for main- 16 taining'a pilot flame in lighting proximity to the main burner as long as said safety valve remains open, said last-mentionedL means being operative to maintain said pilot flame independent of the position of said main shutol valve.

23. In an oven lighting system for a gas stove, the combination of a main burner connected to a gas supply, a manually actuated main shut-off valve in the gas supply line to the main burner operative when open to permit the supply of gas to the main burner, a safety valve in the gas supply line to the main burnerhaving an open position permitting the supply of gas to the main burner, anY ignition pilot burner in lighting proximityjto the main burner, means controlled in response to Ythe position of said safety valve operative to maintain a stand-by pilot ame in lighting proximity to the main burner as long as said safety valve is open, said stand-by pilot means being operative to maintain said pilot flame independent of said main shut-off valve, and means responsive to 'an uninterrupted opening movement of'said manually actuated main-shut-off valvefor igniting said ignition pilot burner and for openingsaid safety valve to the main burner to supply gas to the main 'burner after ignition of said ignition pilot burner.

24. In an oven lighting system for a gas stove, the combination of a main Aburner connected to a gas supply, an ignition pilot burner in lightingproximity to the main burner, a manually `actuated main shut-off valve in the gas supply line to the main burner controlling the supply of gas to said ignition pilot burner operative when open to permit the supply of gas to the main burner and to said ignition pilot burner, a safety valve in the gas supply line to the main burner having an open position permitting the supply of gas to the'main burner, means operative in response to the positioning of said main shut-off valve in open position to ignite said ignition pilot burner and to open sad safetyvalve for'the main burner after ignition of said ignition pilot burner` to supply gas to the main burner in said open position of said main shutoff valve, and means controlled in response to the position of said safety valve operative to maintain a pilot flame in lighting proximity to the main burner as long as said safety valve is open,said last-mentioned means being operative to maintain said pilot flame independent of the position of said main shut-off valve. p l

25. In an oven lighting system, the combination of an oven burner connected to a gas supply, a pilot burner in lighting proximity to said oven burner, a safety valve interposed-in the gas supply line to the oven burner for controlling the flow of gas thereto,heat responsive means positioned adjacent said pilot burner and operative when sufficiently heated to maintain ,said safety valve open to permit theow of gas to the oven burner, a manual Y shut-oft valve interposed inthe gas supply line to Vthe oven burner to control the gas supply thereto, means operk-` ative While said manual valve is open to supply gas to the oven burner when said safety valve is open and to maintain a tiame at said pilot'burner in lighting proximity to the oven burnerV suicient to render said heat responsive means operative to hold open said safety Valve, and

means operative to maintain a pilot flame out of heat transmitting relation to said heat responsive means in lighting yproximity to -theoven burner independently of saidv manual valve aslong as said safety valve remains i open, said last-mentioned Vmeans being ineffective romaintion Yof said main shut-0H valve for igniting Vsaid ignition pilot burner means, means operative in response to said actuation of said main shut-olf valve after a time delay to open said safety valve means to supply gas to the main burner after ignition of said ignition pilot burner means, thermal responsive means adjacent said ignition pilot burner means operative when heated to hold open said safety valve means for the main burner to supply gas thereto, stand-by pilot burner means in lighting proximity to the main burner, and valve means for said stand-by pilot burner means operative to supply gas thereto independently of said main shut-off valve as long as said safety valve for the main burner remains open.

27. ln an oven lighting system for a gas stove, the combination of a main burner connected to a gas supply, ignition pilot burner means in lighting proximity to the main burner, manually actuated shut-off valve means in the gas supply lines to the main burner and to said ignition pilot burner means, a normally closed safety valve controlling the flow of gas to the main burner, means responsive to continuous movement of said main shut-off valve means to open position to supply gas to said ignition pilot burner means and to ignite the same, means operative after said ignition of said ignition pilot burner means to open said safety Valve for the main burner to permit the supply of gas thereto in said open position of said main shut-oit valve means and to hold open said safety valve as long as said ignition pilot burner means remains lighted, and means controlled responsive to the position of said safety valve operative to maintain a pilot ame in lighting proximity to the main burner as long as said safety valve remains open, said East-mentioned means being operative to maintain such pilot flame independent of the position of said main shut-off valve.

28. ln an oven lighting system for a gas stove, in combination, a main burner connected to a gas supply, a normally closed safety valve controlling the ow of gas to said main burner, a manually controlled main shut-oif valve in the gas supply line to the main burner operable when open to permit the supply of gas to the main burner, ignition pilot burner means in lighting proximity to the main burner, a remote constantly burning pilot burner, intermediate pilot burner means communicating with said remote pilot burner and with said ignition pilot burner means, normally open valve means in the gas supply line to said intermediate pilot burner means positioned in its open position when said safety valve for the burner is closed and positioned in its closed position when said safety Valve for the main burner is open, thermal responsive means positioned adjacent said ignition pilot burner means to be heated thereby, and means responsive to uninterrupted opening movement of said main shut-off valve to supply gas to said intermediate pilot burner means for ignition thereof from said remote constant pilot burner and to supply gas to said ignition pilot burner means for ignition thereof from said intermediate pilot burner means, said thermal responsive means being operable responsive to ignition of said ignition pilot burner means to hold open said safety valve for the main burner to permit the supply of gas thereto for ignition from said ignition pilot burner means, said normally open valve means in the gas supply line to said intermediate pilot burner means closing to shut oitthe gas supply to said intermediate pilot burner means as said safety valve for the main burner opens to supply gas to the main burner, and means for maintaining a pilot flame in lighting proximity to the main burner independently of the position of said main shut-off valve as long as said safety valve for the main burner remains open.

29. In an oven lighting system for a gas stove, in combination, a main burner connected to a gas supply, a normally closed safety valve controlling the dow of gas to said main burner, a manually controlled main shutoff valve in the gas supply line to the main burner operable when open to permit the supply of gas to the main burner,

ignition pilot burner means in lighting proximity to the main burner, a remote constantly burning pilot burner, intermediate pilot burner means communicating with said remote constant pilot burner and with said ignition pilot burner means, normally open valve means in the gas suppiy line to said intermediate pilot burner means open when said safety valve for the main burner is closed and closed when said safety valve for the main burner is open, means responsive to uninterrupted opening movement of said main shut-off valve to supply gas to said intermediate pilot burner means for ignition thereof from said remote constant pilot burner and to supply gas to said ignition pilot burner means for ignition thereof from said intermediate pilot burner means, means operative after ignition of said ignition pilot burner means to open said safety valve for the main burner to permit the supply of gas thereto from said ignition pilot burner means and to hold open said safety valve as long as said ignition pilot burner means remains lighted, said nor-A mally open valve means in the gas supply line to said intermediate pilot burner means closing to interrupt the gas supply thereto upon opening of said safety valve for the main burner, and means controlled responsive to the position of said safety valve for the main burner operative to maintain a pilot llame in lighting proximity to the main burner as long as said safety valve remains open, said last-mentioned means being operative to maintain such pilot flame independent of the position of said main shut-o valve,

30. In a gas burner ignition system, in combination, a safety valve comprising a valve body formed with a pair of inlet ports, a main burner outlet port, an auxiliary pilot burner outlet port, and an ignition pilot burner outlet port, first and second closure members in the valve body movable unitarily between extreme positions for controlling the ow of gas from the first inlet port through the main burner outlet port and the auxiliary pilot burner outlet port, a third closure member in the Valve body movable unitarily with the first closure member between extreme positions for controlling the ow of gas from the second inlet port through the ignition pilot burner outlet port, resilient means within the valve body biasing the closure members to a position in which communication is established between the first inlet port and the auxiliary pilot `uurner outlet port and in which the main burner outlet port is blocked by the first closure member from communication with the first inlet port and in which the ignition pilot burner outlet port is blocked by the third closure member from communication with the second inlet port, and time delay means for said safety valve operative after a time delay to effect movement of the first closure member to a second position in which the auxiliary pilot burner outlet port is blocked by the second closure member from communication with the first inlet port and in which communication is established between the first inlet port and the main burner outlet port and in which communication is established between the second inlet port and the ignition pilot burner outlet port, said time delay means being rendered operative after a time delay following the passage of gas from the first inlet port through the auxiliary pilot burner outlet port.

3l. ln an oven lighting system for a gas stove having means including a manually actuated main shut-off valve providing a gas supply to the main oven burner, the combination of a pilot burner for lighting the main oven burner, a safety valve interposed in the gas supply line to the main oven burner operative to control the supply of gas thereto, heat responsive means positioned adjacent said pilot burner and operative when heated thereby to maintain said safety valve open to permit the ow of gas to the main oven burner, means operative in response to the opening of said main shut-off Valve to supply gas to said pilot burner and to supply gas to said safety Valve for passage therethrough to the main oven burner after ignition of said pilot burner, and by-pass means operative Y 1,9 after the ignition of the main oven burner and while the safety valve is open to supply gas independent of said main shut-off valve to insure lighting of the main oven burner in case the main shut-off valve is closed and then is opened again before the safety valve closes.

32. 1n yan Voven lighting system for a gas stove having Y a top pilot burner, the combination of conduit means providing a gas supply line to the main oven burner, a manually controlled main shut-olf valve in the gas supplyY line to the main oven burner having an open position permitting the supply of gas thereto, ash pilot burner means operative yto receive ignition from the top pilot burner on the stove, an ignition pilot burner for igniting the main oven burner-*positioned to receive ignition from saidrfl'ash pilot burner means, safetyvalve means con- `Vtrolling the .gas supplies to the 'main oven burner and to said iiashv pilot burner means and having inlet means communicating with saidmain shut-off valve to receive gas therefrom,` means operative when said main shut-olf Yvalve Vis moved to said open position to initially supply gas to said iiash pilot burner/means and to said ignition pilot burner forigniting vthe ignition pilot burner, said safety valve means being operative after a time delay following ignition of said ignition pilot burner to move to a positionin which it permits the passage of gas from Vsaid main shut-off valve in said open position thereof to the`main oven burnerV for ignition by said Vignition pilot Y burner and shuts otf the flow of gas to said flash pilot burner means, said safety valve means being held in the Y Ylatter position responsive to heat from said ignition pilot Y burner, and by-pass means operative after said movement of the safety valve means to the latter position to VVsupplyV gas independent of said main shut-off valve to insure that the main oven burner shall be lighted if the main `shut-off valve is closed and then is opened again before the safety valve meansV returns to its original position. p Y

V33;` In'an oven lighting system, the combination of an oven burner arranged toV beconnected to a source of fuel, a safety Vvalve movable' between an open and a closed position vcontrolling the 110W of fuel to said burner, afirst combination pilot-burner and supply means in Y Ylighting proximity with said oven burner and arranged to be connected to the source of fuel, a second Ycombination pilot burner and Vsupply means in lighting proX- i imity with Vsaid oven burner and arranged to be connected tov said source'. of fuel, means responsive Yto the heat ofsaid first combination pilot burner and supply Y means for holding said safety valve in the open position, and valve means controlled by said safety valve for maintaining Vthe ow of fuel to said second combination pilot Y burnery andrsup'ply means at all times thaty said safety valve is opento maintain the ilowrof fuel. to said oven burner. Y

34.111 a mainV burner lighting system, the combination of a main burner arranged to be connected to a source of fuel, a safety valve controlling the ow of, fuel to saidmain burner having a normally closed position and anV open position, a first pilot burner means forY producing a flame in lighting proximity to the main burner, afstand-by pilot burner means for producing a ame in to be connected to a source of fuel, aV constantly burning pilot burner remotely located with respect to said rst pilotburner means and said stand-by pilot burner means, means yforV flashing flame from the constantly burning pilot burner to said first pilot burner means, means forY opening the safety valve, means out of heat transmittingv Y relation with'the flame of said stand-by pilot burner means Vancl responsive to the heat of the flame of said first pilot burner. means for holding the safety valve in its lighting Aproximity with said main burner and arranged n open position, means for controlling the iiow of fuel to said stand-by pilot burner means including a valve meansV having an open and a normally Vclosed position, and

means out of heat transmitting relation with the tiame Y of said stand-by pilot burner 'means and responsive to Y the heat of the flame of said tirst pilot burner means for maintaining said valve meansV in an open position to supply fuel to said stand-by pilot burner means while said safety valve is open.

35. In a main burner lighting system, the combina-` tion of V a main burner adapted to' be connected to a source of fuel, a constantly burning pilot burner remotely located from said main burner, a rst pilot burner means fo yproducing a ame in lighting .proximity with said main'burner, means for igniting said first pilot burner means from said constantly burning pilot.V burner, a

safety valve for controlling the ow of fuel to said main 'Y burner having an open and a 'closedrpositiom said valve being normally biased to a closed postion, thermal means.

responsive to the heat of the flame of saidfirst pilot burner means for holding said safety valve in an open position, a stand-bypilot burnerrmeans adapted to be Y connected to a source of fuel and having means for pro ducing a flame out of heat transmitting relation to said thermal means and in lighting proximity -to said main burner, and valve means operatively associated with said stand-by pilot burner means and having an open and a closed position, said valve means normally biased to a` closed position and being operatively connected to said thermal responsive means andiupon heating and operation thereof' said valve means beingV Ymovable to itsV Y open position to maintain a ow of fuel to said standby pilot burner means while said safetyV valve is open.Y

36.7In arburner control'system wherein there is a main burner, pilot burner meansv for lighting said main burner, Vsaid pilot burner means comprising ariirst pilot burner, a fuel supply line for supplying fuel to said main burner, a fuel supply linel for supplying fuel to said rst pilot burner, a safety shut-oit valve in the fuel supplyline for theV main burner and operable to a closed position to shut olf the supply of fuel to said main burner, valve means in the fuel supply line for said irstpilot burner and operable to closed position when saids'afety shutolf valvev in the fuel supply line for the rn'anhurner is open, whereby to shut off the supply of' fuel to said iirst pilot burnenthe combination withV said system of standby pilot burner means in juxtaposition toV the main burnerfor 'relighting'said main burner Whenthe safety shut-offV valve in the fuel supply line to the main burner is` in open position and the valve means inf the fuel supply line for said first pilot burner is closed, said safety shut-off valve*l Vin the fuel supply line for the main burner comprisinga valve body having an outlet port for supplying fuel to said first pilot burner, a fuel supply means for said` outlet port,` and a valve member under the control of n the safety shut-off valve` for controlling the supply of fuel through said fuel supply means to said porti.

i References Cited in the file of this patent UNITED STATES PATENTS Caparone Junev 22, 1948 

